Scientists have collected a wealth of physical and chemical data for the Sun, planets, and small bodies in our solar system, but until now this information has been scattered throughout the technical literature. The Planetary Scientist's Companion solves this problem, providing for the first time a single, extensive reference for the interdisciplinary fields of planetary science and cosmochemistry. A unique and practical resource for anyone interested in contemporary planetary science and cosmochemistry, this volume is likely to be an essential tool in future research.